My compeitors have recently started adding a "content shop"- such as a e-commerence store would have. So instead of sending an invoice they pay first through paypal automactially through a checkout on the website. their content shops look really professional however, such as copify. com and writtent .com I have searched where I can find similar but cannot find anything. Is it jut a plugin they are using or have they had them made? Do you know anything about this?